AUT
- Aeronautica Umbra Trojani AUT.18
- Agongointo-Zoungoudo Underground Town
- Aktio–Preveza Undersea Tunnel
- American University of Technology
- Amirkabir University of Technology
- Aristotle University of Thessaloniki
- Arriva UK Trains
- Association of University Teachers
- Atauro Island
- Atlantis Underwater Tycoon
- Auckland University of Technology
- Austria
- Aut Even Hospital
- Autauga Northern Railroad
- Auto-Train Corporation
- Autonomous Things